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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0841d20ed8e148191c395adf037f4cf2f54c0653392f4385979da51c283f9f' 
  AND token = 'fV7vWQj8pO45bWFTb9Ju/24y2UM4uyGwKwZXPu//iO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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