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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c74f7586bb901b301eb3c36d6e833bafc0574b97e576ac9d608c62fe6a36d32' 
  AND token = 'AjF6M/BYtMjikABgAglM/XtLuelUM+y6N9heygaTzZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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