Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5da99294cbd69ca53883e58b614168d91a694762fb06df4c5329a6016164458' 
  AND token = 'OxBz1+cSt9O38fxnR/RZZF4uFdBCiRQD5pkB486yyR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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