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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389556c1f82b83858f6d5dd76b3b54e6568eabe085a8bcc784fa72ffc10b60eb' 
  AND token = '23GYOt9WBhd0cx4qeeQ5sC5g6JsYByASyI+/rZ/hMko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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