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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1aec80aa60919f1fd3757fd29a927fab4d8a8dd3d4ba07007970fd3b60260fc' 
  AND token = 'Q9Br1y2c1CG2kGXi23D6I7QKijlcChefi8++kA034Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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