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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96d3bf28916ea8f4370e92beea76265c844c294814c946f66d5c23b5b5338ce' 
  AND token = 'fOVEDT5Fpb1mqECic5EDBwNHPSU9mz6XPk035lms5Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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