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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26fd0f8aa841e9b464f8b178f41165399d92360072eed933ae53cf9c8342830' 
  AND token = 'NpKuli3sVrpkkJ6K8bILTHKXQxMQ2bTuWZCwPePoDMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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