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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d1c6e6309761244242d8c0ba0ccc5b8276bc311698873702e2d5eb2cf6a7fb' 
  AND token = 'V5ZYbXG90qD1E4RSEi1JSLr+XOdCirV2dvgwxjyqQFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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