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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6729e76fac9e19aca48c83e5e4a84bfbeb376cb6df9fbe0607d64a5c159ca15' 
  AND token = 'F1m0EUB3qrnk668uqAmWU7HjeL49ptraEejIDi1rCoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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