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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2ce524996dbb2243faddf53a4efe325ae3edf1d44283757d18d2c396c3ac51' 
  AND token = 'fpA3Dl5F4JRW6SO/cjUJeQTUwPvi45DC+hoA9zfowHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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