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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba980ca165a22e54cf80ca0486c5abe7bd53102d444de537bebd82eafee7f796' 
  AND token = '1yCYTKsakWtLi9qISiWaz7fB3Ri6HcKTBqBu0Y+1WTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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