SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3845522a921bf3848fa82bb082448064ccb1be776733c1198ced941f8925bb8a' 
  AND token = 'ZOR/Giemd6Mjq7m1LYZZiDgfKwNz866mrzw8Vz63J4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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