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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc71ab533ae9ac17938fbc4b26e9ce5e3a799e73b7ed17e2ec688e9a61a98b9' 
  AND token = 'ZNdw6n8XY0gSJ8kXtWmHBRrQYdCeiUpJ+feAeYAu+Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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