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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1001304f03205e509441bf1ed13e968e883220517c0367fc84c6c06ab015c59' 
  AND token = '5iL64emF7cnWHKJDRbkHk9tQ671f40J6wP84ZwF1rtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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