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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489acf770e34b6116ccd7d6d8046c85c26fef8f3ea7a15c9f26dcc2f395fa0b2' 
  AND token = 'KQhWjHhN+UEyxuQEvMLi3MNor8LI/aPRGh00tpoaVSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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