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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bbd6b9e70c472e716105d724aa9721ab5555a1e994c0c3efa4ec88c5485542' 
  AND token = 'g/PERkwHqMSuHpS4lde5+SXXvOby7orZP3IJ4sy5XGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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