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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9583cc78e2fbece6a6e05db0dddcff16e7b39cf0a8280591c397e111e9fed8f1' 
  AND token = 'ANc7fd1rOutO/aPwaQGPqsCbs9l4laJGPhDg1a9kCTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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