SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0a4d644b694507a5ebe0557bca982c3f5277bb33f738d0633793ff0d9ea87e' 
  AND token = 'q8KHCzquz4pgojfo7Q+nuvsuAaIiKtesZJGfvU8cF/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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