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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159779df3188e3de45a90575f5d5e001ac00d157b67f10491199f3a81a73976c' 
  AND token = 'd7dy5ZM/hd9/zlnR4fs5iQeIyVJZDCl2Kz5sMM9KTIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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