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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7037fcbdef09b6ecb832b4070113db07cbda5ac13b6e83b82d78eec9234f93' 
  AND token = 'sGSUuWoEs9TS6nZYLZu5vkU3RpxC0SJ0WNKA8OgPnuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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