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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec19b934a317eece5ee51bf7fa069bf28f35978b65b127e860eed1ba4de24fa' 
  AND token = 'ZnV4gykM4br+wWBU+JeslTcCVSQk7gjoqewpL0WH3tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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