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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee3448d26e35c60e04b52d40b49eb276e04107a8db55e3ae8b05c867ea342ac' 
  AND token = 'u1L4RrMb2WOrN32uM1QNUt/xYj1khWT7QLyvz1eXyFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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