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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190d62bc1903b43f9665ce8ca3bfaf910d7db87759db3ada8ed7e5301ca20095' 
  AND token = 'Wda9BwsGCaEaqiV1cv9iaVwUHFIjOv6S5EquYw4/TQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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