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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6deaaf142c932db1968872d08de6a40a49a56bb0bf8dd4b665b481101fd0995e' 
  AND token = 'sNZ4bybtqnOIxj4kuICkLs/pCl1OlRLKQQfIYBptagA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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