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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e7f3779e3a1eb755c6032a17a351d9677e2dbce6ac3032bbefcf1f4f9b2e53' 
  AND token = 'Ig6yWf80FxzUITAsK3ozgL/psQGJHcuISCQD9o5iuIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}