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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f478665c9d79c4278ece19ff40c20b765384c0b1a094ff01e51b53ef4d7c1fd0' 
  AND token = '2b1ZHbWrKwlKXwIj6iq38DrnJ/lNGm1noMK6NiNZ6fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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