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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f36bab39648d89ff791c4404640cd7c71b1164f235c4e4daf618dfba3694e4' 
  AND token = 'jFhBvbaMqTPilsyXBYRC50ITBBG4EvPrxzp36pns18I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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