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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd07fa3dba7f7c80924ccf8fad67c7a40bafb70a79ab80ccb1ba541476fe9a6' 
  AND token = 'c4OUY+TGmTpP3olMZ9FvDlgT38nEXbw82m0Z6nbD3Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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