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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84888f521b220340c7846cf3ac86d38f0d20b51577edc9561ff39087dfde4062' 
  AND token = '2APnzideJD0FkSSksTB8sR9v/wZQc6i6CGrbPG2GeCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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