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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b33c79d5c9ec527ba8261050fbf8ee0f25faf6ce0df3702f6de1fd49ef87199' 
  AND token = 'xDfMtc5R8Aqp5ctyxrIwZ1hfTRWp2bcmi1O9Of2Wd9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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