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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f477f1df64463354b4e20cdfd197d88b070674be4c08381863ff6f1a3c263ba2' 
  AND token = 'Ez8awq9p50JA3VgYVcwbd5VbHA5cTfarKAKTLKYeNeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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