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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81a499ac959039bcc05f6e94c271a84f04a2e4048dc29754fb7d78d06cab7cd' 
  AND token = 'Mq3IOsPMYInazGo1ZLkELB5b1dJnK6YrTX/HynM44hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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