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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4438d0c317055b5f3ac0c2f156265b3240b241467d096e8f730bb16eae5f5e6c' 
  AND token = '9mmENUvqdNldgO4Kmp2bxeg5FZ/5f5I5PRSiCeiEiyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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