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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7085a5ba907b0ff2d28fcbebb29f09cfa029c17cea6c6026661d636caf27873' 
  AND token = 'XGmADX1ouZI8icuikflDcO266hQnyWu3Wc7HzeS1LxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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