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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d40b2f1e255d47ad4a69705f286802aa458e8a847a79cc6554cd5a3dae71a5b' 
  AND token = '5mt7lxTq5AdEi7u1N0NJq3bFFIvcOyW+s8eUrdRvxck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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