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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4994d45f7d45992803f8ac64d271a821e7f58d0fe54612353b4789f1326231' 
  AND token = 'ai4t185aVN8VLvdFFGDgQ1redkP//9q/V6v/DhcHyTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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