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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850c89a72c22a724f8bfc82352933c269a5818978b078f22a49fb8cb45dd3356' 
  AND token = '0e17NlyysAzjvIR82tYsomwORMog25TM76lEYyb9APM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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