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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1cd23c8ebea2268fb3933dffcf8cde8d75901a213eded219890c4e21e1fc0f' 
  AND token = 'BjON0mNxAkegABocHRT28bioDbG56XKd+2/yZj3uZsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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