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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffa5c130331003e498a1a9a4929ce7d7c6c3b081f41d8fea2e2ad1f74ce3a28' 
  AND token = '+szoTTf5LKAD8eXwnXKE5u53dzuv6PiduCszw6Kmv4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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