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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf000a18faabba10aa7230c691d9d391d437c27b4aad6cdd0db3c505ea907af' 
  AND token = 's4mgxEGtaOuOWdpUZaNnuft4c0Nn6VwBbtBznGUWyCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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