SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a070016473e19f293f38b17f8496f25c9a2c7979d7fea163871b85f6aafe2b' 
  AND token = '23ZEQfQml2+sK4VJGbEQNwrpB9FjZjIdAGtEipcKZpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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