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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cfd6404c3fa67e1d1eaee2dc62966fa39e97741760962992f7d62eb665726d' 
  AND token = 'QX3cOFR7lh5J8dijQdwAaESX3O/Va7RHF56aE2w/KEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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