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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fb03f014c5fef9b87a913427f2e4fd68dd6188f1794b8b5864136145ee0b25' 
  AND token = 'Q65IYejBM4nEtI0RPxUCQPcGXBexzvW7qR046aegtwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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