SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc9b1c104f1b9950705bd5ec8fd68af9c77e03af84038727b16a5f443079ae7' 
  AND token = 'tilvmKgglbQi6KjDYiyzvJvBTpDIc+/fP8Zuvvl3ZhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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