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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4df94e65e15e3c498b8af7a3e207228ca1cc4364314a951c11cd1230720613' 
  AND token = 'Zps6sne8mzUEXVDpi99PxqY7Wqj6HzDwax7zQ2yv81I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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