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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0737ac12234a21b06868e226f1cececda810c64bb56724acb0ebc1ec68823f62' 
  AND token = 'ryIS7EGIEqIsIAsAJV3KwBzhQf6c6BbDxbUH1a4xuag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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