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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f13d2837fc075caaa6df5207434843fff614a237a2d7a80e4df42d98c4702ff' 
  AND token = 'wTNxg3FWfZmdqNTUxhkb1nD0s8yeZ2+FDINyWMJ08vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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