SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2722c0367261dcda87327978e8f8945387cf7c442b11d08cdcfc6243368fdd5' 
  AND token = 'GL+ZLZR0UddrshsCzxIAh8eqoipR/vJgz66qc/NJtsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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