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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ed73fed19b9dd4c385e435f5aa95f09768893b9666e64ff92e38a2f4661eab' 
  AND token = 'vm8La0mn4gUsKFFyOvBemxoXDTQkCCRGe6eSRSYsH0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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