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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfa9fea8eab4b478dd6cbeb3746a84fbfac4efdab8ad712b0030fb2ed8bc5c5' 
  AND token = 'w1sppcTNWjip6pNLqoJg9LAlSHkoGJVT9NaprF3bFLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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