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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797b1438cdb45c428ab60600b754e1ad7e61afaa248cd4144b6044ec5a04e795' 
  AND token = 'RmP7URoeHEdeZ0JC7DumiAL7luW4iNbtYIv4Xqldd9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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