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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badb2e312d880114ad660ddb683927433232bf63ecb56b6eba36ca016e429e05' 
  AND token = '9lc8/47rP7MAD5CatU/5gPSDm0vIQiByq1eR31QPdnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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