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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccf9d0c40ec065ccf418d5a0fb6e80cf5320e6353f5d5294634ea7222b5ed67' 
  AND token = 'mW57nq/cIp7hhZOjKlYlpvyEy5nClnJsbAEG8c96XJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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