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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71df23efabc75c2f08f186beda777ccb2b2951f9c9d0ff59f04fca796d6fd8e3' 
  AND token = 'xDA2jmOzK5xdVWML9PbPRjabjAonLurihz64+Qoh4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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