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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed60b4c32ca84d903d461c7bf99a57141c57ad3a7a171ef4f5f3ab28b135dfaa' 
  AND token = 'rZlYNCW3FFn9sWSOh2oLzm2MRxpIiL8wungsRYSWPro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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