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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae37674660d49946f38d68e2003e2ab1d6d49b89ae59ae6a91a57f3ddfa2ef1' 
  AND token = '/B57CooiamSTO8oFyTn7sTU3pukTRfLXUw5cealZleQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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