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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88c422f0d4e4aab5acdb7a0348cf5ca2acabf6262e6a72eddb0c754223e2130' 
  AND token = 'CP4MV+tLs65EH33kKn3c7A76EZB4yGHx6OKggGRD54Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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