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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327880c492a6a0a87c94e74eec6ba9930a5236b46878d607703c694f8e2f2115' 
  AND token = 'lIt6paJi6naSW9ksIA0LjxDwbHIGi/Rxiv3X5WIwMAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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