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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c7ff7d07e4c62a39527fd963b5946e73c74fbac2fba7c1adff4fa49c16e240' 
  AND token = 'S48EPqITif/k4pP7ARud1btSAbV8e7xk/0j2mz3+Jp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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