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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a656c7f912f8c7849d5d6e31aefec621a536587f1b6d1432d05774dbd7ccba5d' 
  AND token = 'ZMFx3wsgCN04JFDhtQmcVI6iar4qUP89lo1D0mKZwOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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