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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe602e8cab66ec2b190004d932214d22846b7ba2f7f9f02ee4690f9b49d370e' 
  AND token = '91zPnw17nh9vZDJEf8ktdKkWtC8WF26glp0Z3h7Azsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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